An urban solo-sex move in which the person semi intentionally slips on thin air, and then whilst travelling back in time to put the toilet seat up so they fall backwards.
Shit Slipping pres. tense, Shit Slipped past. tense, Shit Slippy adj.
"Yo, my bitch Shit Slipped on Discord for me the other day"
"Yo WTF? I saw a girl die from that shit, bitch had to get brain surgery from the time shit. Fuck a Shit Slip (n.)"